384  
FNCA52 TJSJ 180930  
FWFSJU  
 
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO  
NATIONAL WEATHER SERVICE SAN JUAN PR  
530 AM AST MON OCT 18 2021  
   
DISCUSSION
 
THE KBDI WAS JUST BELOW CRITICAL FIRE WEATHER  
LEVELS AT GUANICA(549), AND WELL BELLOW THRESHOLDS VALUES AT CAMP  
SANTIAGO(383) AND CABO ROJO(464). THE 10-HR FUEL MOISTURE CONTENT  
REMAINS BETWEEN 11-12% ACROSS ALL SITES. LIGHT WINDS ARE EXPECTED  
ONCE AGAIN TODAY, THEREFORE, THE FIRE DANGER REMAINS LOW ALONG THE  
SOUTHERN COASTAL PLAINS.  
 
PRZ014-190930-  
SOUTHEAST COASTAL PLAINS-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 60 10 60  
TEMP (24H TREND) 89 (0) 74 (-1) 89  
RH % (24H TREND) 60 (-3) 88 (-4) 59  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR SE 5  
MIXING HGT(FT-AGL/MSL)4353 4564  
TRANSPORT WND (MPH) E 3 E 6  
VENT RATE (KT-FT) 16232 31901  
DISPERSION 5 5  
DSI 5 1 5  
LAL 3 1 3  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ015-190930-  
SOUTHERN HILLS-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 80 10 60  
TEMP (24H TREND) 87 (+1) 72 (0) 88  
RH % (24H TREND) 60 (-2) 91 (-5) 58  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR LGT/VAR  
MIXING HGT(FT-AGL/MSL)4914 5515  
TRANSPORT WND (MPH) E 3 E 5  
VENT RATE (KT-FT) 17460 28269  
DISPERSION 5 5  
DSI 4 1 5  
LAL 3 2 3  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ016-190930-  
NORTH COASTAL PLAINS-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS SHOWERS SHOWERS  
CHANCE PRECIP (%) 40 30 30  
TEMP (24H TREND) 89 (+1) 76 (+1) 87  
RH % (24H TREND) 62 (-5) 89 (-7) 61  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR NE 6  
MIXING HGT(FT-AGL/MSL)4158 4671  
TRANSPORT WND (MPH) NE 5 NE 8  
VENT RATE (KT-FT) 17574 31540  
DISPERSION 5 5  
DSI 5 1 5  
LAL 2 2 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ017-190930-  
NORTHERN HILLS-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 60 10 50  
TEMP (24H TREND) 87 (0) 73 (0) 86  
RH % (24H TREND) 61 (-2) 91 (-4) 59  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR LGT/VAR  
MIXING HGT(FT-AGL/MSL)5226 5120  
TRANSPORT WND (MPH) E 3 E 6  
VENT RATE (KT-FT) 16016 28824  
DISPERSION 5 5  
DSI 5 1 5  
LAL 3 1 3  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ018-190930-  
WEST COAST-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 80 10 80  
TEMP (24H TREND) 88 (-1) 75 (+1) 88  
RH % (24H TREND) 59 (-2) 87 (-9) 55  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR LGT/VAR  
MIXING HGT(FT-AGL/MSL)4644 4781  
TRANSPORT WND (MPH) SE 2 NE 5  
VENT RATE (KT-FT) 13544 24091  
DISPERSION 4 5  
DSI 5 2 5  
LAL 3 1 3  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ019-190930-  
EASTERN INTERIOR-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 60 30 50  
TEMP (24H TREND) 89 (+1) 72 (0) 88  
RH % (24H TREND) 61 (-3) 96 (-3) 59  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR NE 5  
MIXING HGT(FT-AGL/MSL)4979 5631  
TRANSPORT WND (MPH) NE 3 NE 7  
VENT RATE (KT-FT) 16525 28920  
DISPERSION 5 5  
DSI 5 1 5  
LAL 3 2 3  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ022-190930-  
LUQUILLO MOUNTAIN RANGE-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS TSTMS TSTMS  
CHANCE PRECIP (%) 60 40 40  
TEMP (24H TREND) 86 (+2) 69 (-3) 85  
RH % (24H TREND) 62 (-6) 98 (+1) 62  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR E 6  
MIXING HGT(FT-AGL/MSL)4174 4775  
TRANSPORT WND (MPH) NE 3 NE 6  
VENT RATE (KT-FT) 13745 25589  
DISPERSION 4 5  
DSI 5 1 5  
LAL 3 2 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ023-190930-  
CENTRAL MOUNTAIN RANGE-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS NONE TSTMS  
CHANCE PRECIP (%) 80 0 70  
TEMP (24H TREND) 87 (+1) 69 (-1) 88  
RH % (24H TREND) 60 (0) 92 (-4) 57  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR LGT/VAR  
MIXING HGT(FT-AGL/MSL)5428 5571  
TRANSPORT WND (MPH) E 2 NE 3  
VENT RATE (KT-FT) 10856 22284  
DISPERSION 4 5  
DSI 4 1 5  
LAL 3 1 3  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ024-190930-  
CAYEY MOUNTAIN RANGE-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 70 30 50  
TEMP (24H TREND) 87 (+2) 71 (0) 85  
RH % (24H TREND) 63 (-2) 93 (-7) 64  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR E 5  
MIXING HGT(FT-AGL/MSL)4366 5207  
TRANSPORT WND (MPH) E 3 NE 7  
VENT RATE (KT-FT) 17599 29514  
DISPERSION 5 5  
DSI 5 1 5  
LAL 3 2 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ025-190930-  
VIEQUES-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS TSTMS TSTMS  
CHANCE PRECIP (%) 50 50 50  
TEMP (24H TREND) 88 (-1) 77 (+2) 89  
RH % (24H TREND) 60 (-3) 89 (-7) 59  
20FTWND-VAL/AM(MPH) LGT/VAR NE 6  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR E 7  
MIXING HGT(FT-AGL/MSL)3217 3478  
TRANSPORT WND (MPH) E 7 E 8  
VENT RATE (KT-FT) 19290 27655  
DISPERSION 5 5  
DSI 6 4 6  
LAL 3 2 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ026-190930-  
CULEBRA-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS TSTMS TSTMS  
CHANCE PRECIP (%) 60 50 50  
TEMP (24H TREND) 88 (0) 78 (0) 90  
RH % (24H TREND) 59 (-5) 88 (-2) 58  
20FTWND-VAL/AM(MPH) LGT/VAR E 6  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR E 7  
MIXING HGT(FT-AGL/MSL)3167 3507  
TRANSPORT WND (MPH) E 6 E 8  
VENT RATE (KT-FT) 15835 24549  
DISPERSION 4 5  
DSI 6 4 6  
LAL 3 2 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
PRZ027-190930-  
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY MCLEAR PCLDY  
PRECIP TYPE TSTMS SHOWERS TSTMS  
CHANCE PRECIP (%) 70 10 80  
TEMP (24H TREND) 89 (+1) 75 (+1) 89  
RH % (24H TREND) 60 (-2) 87 (-10) 56  
20FTWND-VAL/AM(MPH) LGT/VAR LGT/VAR  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR SE 5  
MIXING HGT(FT-AGL/MSL)4632 4894  
TRANSPORT WND (MPH) SE 3 E 3  
VENT RATE (KT-FT) 16536 20536  
DISPERSION 5 5  
DSI 5 2 5  
LAL 3 2 3  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
VIZ001-190930-  
SAINT THOMAS AND SAINT JOHN-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS TSTMS TSTMS  
CHANCE PRECIP (%) 60 50 50  
TEMP (24H TREND) 88 (+3) 75 (-4) 89  
RH % (24H TREND) 61 (-9) 94 (+7) 59  
20FTWND-VAL/AM(MPH) LGT/VAR E 6  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR E 8  
MIXING HGT(FT-AGL/MSL)3155 3479  
TRANSPORT WND (MPH) E 6 E 8  
VENT RATE (KT-FT) 15775 27248  
DISPERSION 4 5  
DSI 6 4 6  
LAL 3 2 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 
VIZ002-190930-  
ST CROIX-  
530 AM AST MON OCT 18 2021  
 
TODAY TONIGHT TUE  
 
CLOUD COVER PCLDY PCLDY PCLDY  
PRECIP TYPE TSTMS TSTMS TSTMS  
CHANCE PRECIP (%) 40 50 50  
TEMP (24H TREND) 89 (+2) 74 (0) 88  
RH % (24H TREND) 60 (-7) 98 (+1) 61  
20FTWND-VAL/AM(MPH) LGT/VAR E 7  
20FTWND-RDG/PM(MPH) LGT/VAR LGT/VAR E 8  
MIXING HGT(FT-AGL/MSL)4085 4550  
TRANSPORT WND (MPH) E 3 E 9  
VENT RATE (KT-FT) 12255 36400  
DISPERSION 4 5  
DSI 5 3 6  
LAL 2 2 2  
HAINES INDEX 3 3 3  
 
REMARKS...NONE.  
 

 
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab PR Page Main Text Page